Texas Instruments LM5108EVM, Руководство пользователя, Страница: 2 / 20

Introduction
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2 SLUUC42 – January 2020
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Using the LM5108EVM
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1 Introduction
The LM5108EVM is designed to primarily evaluate the LM5108 performance. This driver is a 100-V boot
voltage, high-side, low-side driver with 1.5-A peak source and 2.5-A sink current for driving two N-Channel
MOSFETs. The same board can be used to evaluate other pin-to-pin compatible parts in the supported
package. The LM5108 has low propagation delay and low propagation delay matching between the high-
and low-side rising and falling edges of the driver outputs for reliable timing of the gate-drive signals. The
LM5108 inputs can tolerate signals as high as 16 V regardless of the V
DD
voltage which enhances device
robustness.
The LM5108 driver includes an enable function which enables the driver outputs when pulled high, and
disables the driver into a very low standby current mode when low. The LM5108 also includes an interlock
feature which sets both LO and HO driver outputs low when both LI and HI inputs are high at the same
time. This prevents turning on the high-side and low-side MOSFETs at the same time enhancing
robustness of the power train design.
2 Description
The EVM is developed in such a way that the LM5108 driver performance can be evaluated and
compared to data sheet parameters, or externally connected to power devices with provisions for source
and sink gate-resistance flexibility. The LM5108EVM evaluation board uses surface-mount test points
allowing connection to LI, HI, VDD, and HB inputs. A variety of other test points are available for probing
the LM5108. The input bias is configured such that the VHB-VHS high-side bias can be sourced from
VCC, or an external additional bias can be added to provide VHB-VHS directly. The high- and low-side
driver output returns are separated on HS and GND respectively to allow evaluation of the LM5108 HS
negative voltage capabilities. For detailed device information, see
LM5108 Datasheet .
2.1 Features
The EVM supports the following features:
• EVM for the low-voltage features of the LM5108 gate driver
• 6-V to 16-V VCC power supply range
• TTL-compatible inputs
• PCB layout optimized for bias supply bypassing cap, gate-drive resistance selection
• Capacitive load, external gate drive resistor and diode for gate drive network evaluation
• Allows quick verification of most of the data sheet parameters
• Test points allow probing all the key pins of the LM5108